Created attachment 476242 [details]
File: backtrace

Thanks for a bug report. his seems to be something in gtk or gdk-pixbuf,thus I'm moving it to gtk (becuase I'm not sure which one of these two is more appropriate).

Thread 1 (Thread 2641):
#0  0x0000003d96279860 in _int_malloc () from /lib64/libc.so.6
#1  0x0000003d9627de75 in calloc () from /lib64/libc.so.6
#2  0x0000003d99248baa in g_malloc0 (n_bytes=88) at gmem.c:196
#3  0x0000003da0e18b86 in gdk_pixbuf__png_image_begin_load (size_func=0x3da0e0b9a0 <gdk_pixbuf_loader_size_func>, prepare_func=0x3da0e0ba50 <gdk_pixbuf_loader_prepare>, update_func=0x3da0e0b8c0 <gdk_pixbuf_loader_update>, user_data=0x4b7f260, error=0x7fff4e0f3d98) at io-png.c:424
#4  0x0000003da0e0b582 in gdk_pixbuf_loader_load_module (loader=0x4b7f260 [GdkPixbufLoader], image_type=<value optimized out>, error=0x7fff4e0f3d98) at gdk-pixbuf-loader.c:384
#5  0x0000003da0e0c0c8 in gdk_pixbuf_loader_close (loader=0x4b7f260 [GdkPixbufLoader], error=0x2491348) at gdk-pixbuf-loader.c:713
#7  0x0000003da0e0a0ba in gdk_pixbuf_new_from_stream (stream=0x3377180 [GLocalFileInputStream], cancellable=0x0, error=0x2491348) at gdk-pixbuf-io.c:1480
#8  0x000000386bd17638 in icon_info_ensure_scale_and_pixbuf (icon_info=0x2491300, scale_only=<value optimized out>) at gtkicontheme.c:2984
#9  0x000000386bd19f02 in IA__gtk_icon_info_load_icon (icon_info=0x2491300, error=0x0) at gtkicontheme.c:3066
#10 0x000000386bc9e0b5 in gtk_cell_renderer_pixbuf_create_themed_pixbuf (cell=0x2d653c0 [GtkCellRendererPixbuf], widget=0x2dba030 [EMailSidebar], cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0x7fff4e103f60, height=0x7fff4e103f64) at gtkcellrendererpixbuf.c:537
#11 gtk_cell_renderer_pixbuf_get_size (cell=0x2d653c0 [GtkCellRendererPixbuf], widget=0x2dba030 [EMailSidebar], cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0x7fff4e103f60, height=0x7fff4e103f64) at gtkcellrendererpixbuf.c:615
#12 0x000000386be75750 in IA__gtk_tree_view_column_cell_get_size (tree_column=0x2de5540 [GtkTreeViewColumn], cell_area=0x0, x_offset=0x0, y_offset=0x0, width=0x7fff4e104080, height=0x7fff4e10407c) at gtktreeviewcolumn.c:2645
#13 0x000000386be5a890 in validate_row (tree_view=0x2dba030 [EMailSidebar], tree=0x30b6250, node=0x3132580, iter=0x7fff4e104150, path=<value optimized out>) at gtktreeview.c:5779
#14 0x000000386be5ece3 in validate_visible_area (tree_view=0x2dba030 [EMailSidebar]) at gtktreeview.c:6100
#15 0x000000386be5f143 in do_presize_handler (tree_view=0x2dba030 [EMailSidebar]) at gtktreeview.c:6426
#16 0x000000386be5f20c in presize_handler_callback (data=0x2dba030) at gtktreeview.c:6448
#17 0x000000386c41e1a6 in gdk_threads_dispatch (data=0x4b7ea00) at gdk.c:512
#18 0x0000003d99241e33 in g_main_dispatch (context=0x24413a0) at gmain.c:2149
#19 g_main_context_dispatch (context=0x24413a0) at gmain.c:2702
#20 0x0000003d99242610 in g_main_context_iterate (context=0x24413a0, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2780
#21 0x0000003d99242c82 in g_main_loop_run (loop=0x28ddc50) at gmain.c:2988
#22 0x000000386bd4b0b7 in IA__gtk_main () at gtkmain.c:1237
#23 0x0000000000402679 in main (argc=1, argv=0x7fff4e104588) at main.c:679

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